What is "pappo"

Norberto Aníbal Napolitano, commonly known by his stage name Pappo ( La Paternal, 10 March 1950 – Luján, 24 February 2005), was an Argentinian guitarist, singer-songwriter and composer. He is regarded as one of the best popular artists of his country. He had been considered by B.B. King as one of the best guitarists of all time.